Air-inlet-controlling device for furnaces



Sept. 2 9, 1925. 1,555,678

P. LEVE UE v AIR INLET CONTROLLING DEVICE PO)! ZURNAGSS- Filed Aug. 26, 1 924 Patented Sept. 29, 1925. 1

UNITED PATENT oFFicE,

PAUL LnvnqUn, or neussnns, BELGIUM, Assrenonmo soornrnnn NONUOLL-EQTI 'rnoMAs ET 2. LnvnQUE, or BRUSSELS, BE IU AIRFINI IE I -OQNTROLLING DEVICE tron F nNAoEsL .hnrl et on fil d Au us 26, 1824-. s r e wlim were 0 a when t my m m-- B it n wn that I, A L hom bjec of th fer t e Belg s; s

at Brus s, n e. re ime o e m, ave invented ee tem ne and s u I provements in Air-Inlet-Qontrolling De vices for Furnaces, of which the following 18 e ere ifieeh h- My invention relates to improvements in ht el ns e ces 911 ar use in ,1

' bination with the air inlet flap or damper of a steam generator or industrial kiln or en of t ki d in whi h a upli g h nection is provided between the said damper and the furnace door so as to prevent the pen ng f th s id dee Wh he damper is in its open position. I

O e obj c of my in nt o s t ecu ch a c nt o l ng d vi e n hich h pe ition of the air inlet damper will be posiiv ly independ nt o the epe hti n o the l vel" coeperatine' w the fu nace 10 01 to maint n th eme h ts. dosed pe ihe s as t avoid a y possib lity Of t e d mp e g pla d in an n rm d ary p si ion between the position of complete closure or complete opening when the door is left in a corresponding intermediary position.

A further object of my invention is to obtain the required movements of the r damper without any separate operation upon the said damper either to bring the same in its open position or in its closed position the said movements being the consequence of the operation of the lever maintaining the furnace door in it's closed p osltion.

And a still further object of my invention is to secure improved means whereby the movement of the door lever 1s only used for starting the correspondlng movement of the air-inlet damper, the said \Vith these objects in View my invention essentially consists in the special arrangeht e hhihhheh of parts a w he hereinafteinfully desgcflbidflfid pointed out v sy a l reht iew si e hrn eedo ehhehed dra ing and of the corresponding air-inlet conduit.

his i e d ele etieh 9 the epup e connection between the door lever the damper howinghe em e hh eti h in its end positions.

File 5 e d 6 are di sreihm he w h ing t e r la ve ne iti he betw the door operating lever and the connectiqn With he a el mn hthhe v iehe'e esee t he ep etieh- In th e ample hew-v1 l he urn d eh dapt d to ebate 9 the h nge 2 the hue eorerete i the sual had Wel khewn manner with the air feeding conduit 3 h eh is arra ed the a damp r e Fiste te the ee et he' shaf 5- The a d amper is suitab y h l n'eed e a is tain h t in e s ren reei l eh, it ll erpoee a .i ihimhm reeie h e t9 the curre t of airunder pressure which is cirlculatedin he dui 3 in t e dir eh h e the er -OW 6 e njecte in the te -ea h T eer lie Pre ided a u ua W a heed l e .t eases i e hoe h to, maint in the d e-r its closed position. v

Accord'ng to my invention the said lever 7 is provided with an extension 10 which when the door is in its closed position, is hs'es d in he eh 1 f e eehhlihs nne t eh ohhe tih h r 2 h e is P e a 1 at t e en f a hh h l -Wh c is keyed on the shaft 5 of the daniper, outside the feeding conduit 3.

v The connectingb ar provided with a longitudinal slot L6 in which a guide 7. is en a ed he ee snide he hg' d heml of the eem's herete ref the lllHflGQ: I l o The device operates asfollows:

he h he deh he hs i it ti esiresh m he le 7 is ngaged behind he h eh which is p voted and en 9 and rests with its extension within the notch 11 of the connecting bar 12 (Fig. 3).

The air damper 4 is then maintained in its open position as shown at 4 in Fig. 2 and the air which is forced in the air conduit 3 as usual is admitted in the furnace.

If it is necessary to open the door 1, the lever 7 is lifted from the hook 9 and rotated on the pivot 8 in thedirection of the arrow 18 (Fig. 1). Before the door can be turned into its open position, the extension 10 of lever 7 lifts the connecting bar 12 which sliding on the fixed guide 17, carries with it the arm 14 which causes the shaft 5 and consequently the damper 4 to pivot. As the lever 7 is lifted to bedisenga-ged from the hook 9, the extension 10 of the said lever gradually disengages also from the notch 11 of the .connectingbar 12 as shown in Figs. 4 and 5.

The extension 10 becomes finally completely disengaged from the notch 11 (Fig. 5 see position in dotted lines) when lever 7 is in its raised position, out of contact with the hook 9. At this moment the damper 4 is not yet in its closed position but is sufficiently raised to be acted upon by the current of air under pressure circulating in the conduit 8 in the direction of the arrow 6. Under the action of this pressure, the balanced damper 4 is brought in its completely closed position shown at 4 in dotted lines in Fig. 2. This movementof the damper completes the lifting'of the connecting bar 12 which is further displaced with the slot 16 along the fixed guide 17. This supplemental movement of the connecting bar 12, un-

der the dependence of the damper 4 is necessary to bring the connecting bar 12 in a suitable posit-ion to allow. the reengagement of the extension 10 of lever 7 with the notch 11 when the reversed operation is effected that is to say at the moment of closing the door. At this moment when the lever 7 is oscillated downwardly to be engaged with the hook 9, the extension 10 of lever 7 acts in the notch 11 (Fig. 5) to bring the connecting bar 12 again into its initial position. Should this supplemental movement of the connecting bar not take place a little displacement of the connecting bar 12in the downward direction could be sufficient to bring the notch 11 for instance in the position shown Fig. 6 in which the extension 10 of lever 7 would strike against the lateral face 19 of the connecting bar. Owing to the supplemental lifting of the connecting bar 12,0n the contrary, the said bar will be maintained in the position shown in Fig. 5 in which the arc of circle described by the extension 10 of lever 7 is such that the lower edge 20 of this extension will always strike against the lower edge 21 of the notch 11 thus enabling lever 7 to engage again the said notch and to displace the connecting bar downwardly whereby the damper 4 Will be returned in its open position.

It will be observed that the above described arrangement secures a complete dependence between the position of the damper 4 and the position of the door 1. When the door is in its closed position, the damper 4 is in its open position and when the lever 7 is lifted to release'the door, damper 4 is first closed partially under the action of the positive control resulting from the use of the connecting bar 12, the closure being sub sequently completed under the action of the air under pressure. Any air admission in the furnace is thus prevented in an efficient and'certain manner without any other operation than the handling of the oscillating lever 7 controlling the opening and shutting of the furnace door.

"Vhat I claim is:

1. In combination with a furnace doc and with a damper controlling the air feeding inlet in the said furnace, an oscillating lever operable to permit the closing and opening of the furnace door and a coupling connection between the said lever and the damper whereby the operation of the oscillating .lever to permit opening of the door starts the closing movement of the damper.

2. In combination with a furnace a door for said furnace, an air feeding conduit cooperating with the said furnace, a damper in the said conduit, an oscillating lever cooperating with the furnace door, whereby the same is maintained in its closed position, a coupling connection between the said lever to initially move the damper in the operation of the lever, the connection between the damper and lever being thereafter interrupted to permit air closing of the damper.

8. In combination with a furnace, a door for said furnace, a pivoting lever mounted on the said door, and operating to normally hold the door against opening, an air feeding conduit cooperating with the furnace,

whereby the said furnace, may be fed with air under pressure, a damper in the said conduit, a connecting bar, the said bar being provided with a notch in which the door lever is engaged, means for guiding the said connecting bar and a pivoted connection between the said bar and the damper.

4. In combination with a furnace door and with a damper controlling the air feeding inlet to a furnace, of means for normally holding the door in closed position, and a connection between said means and the damper to operate the damper a predetermined distance toward closing position in that movement of the means tending to release the door.

5. In combination with a furnace door and with a damper controlling the air feedlease the door, the damper following such ing inlet to a furnace, of means for normally predetermined movement being freed to the holding the door in closed position, and a influence of the air in said inlet for complet- 10 connection between said means and the ing the closing of the damper. 5 damper to operate the damper a predeter- In testimony whereof I have afiixed my mined distance toward closing position in signature. A

that movement of the means tending to re- PAUL LEVEQUE. 

